1, first of all, the effect, foot patch is not a medicine, it can't cure diseases, its main function is similar to foot massage, it acts on the body by stimulating the acupoints and reflex zones of the foot, and it has no pharmacological effect, so it belongs to physiotherapy products at most, focusing on disease prevention.

2. In addition, foot stickers can't be judged only by black or not. Many counterfeiters take advantage of this. Everyone likes to make a fuss about superficial phenomena, so we must be careful to distinguish them. It is recommended to choose regular and cheap ones.

Finally, note that not all the foot stickers are from old Beijing. This kind of foot patch refers to a unique formula with high cost and good effect. The key is the core formula. Most foot stickers on the market are open formula. Although a manufacturer produces dozens of brands of foot stickers, although the price and packaging are different, the effect is basically the same. These are not old Beijing, so it is recommended to choose formal ones instead of being greedy.